Touch Display Ground Modulation for Simultaneous Driving
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Solution Overview
Problem
Current touch display devices face challenges in simultaneously performing display driving and touch driving due to the time-division driving scheme, which requires precise timing control, expensive components, and results in degraded image quality and touch sensitivity.
Innovation Solution
The implementation of a touch display device that utilizes a ground modulation technique, allowing simultaneous display driving and touch driving by using two types of grounds, with the touch controller grounded to a primary ground and the touch display panel grounded to a secondary ground, enabling the delivery of signals between differently-grounded components without harmful mutual influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-division driving scheme is used, then display driving and touch driving can be performed separately, but image quality and touch sensitivity are degraded due to shortage of driving time
Solution Approach 1:
The patent merges display driving and touch driving into a simultaneous operation mode, eliminating the time-division scheme. Both driving operations are performed at the same time through separate signal paths, thereby increasing the productivity (driving time) for both functions while maintaining their separate operational independence through the merging of their execution environments.
2Reliability
If time-division driving scheme is used, then display and touch functions can be separated, but expensive components and precise timing control are required
Solution Approach 1:
The patent segments the grounding system into two independent parts: a first ground for display driving and a second ground for touch driving. This segmentation allows each function to operate with its own dedicated reference potential, eliminating the need for complex timing control and expensive isolation components while maintaining functional separation.
3Productivity
If simultaneous display driving and touch driving are performed, then image quality and touch sensitivity improve, but harmful mutual influence between driving operations occurs
Solution Approach 1:
The patent creates equipotential zones for display and touch operations by providing separate ground connections. Each driving operation maintains its own reference potential level, preventing harmful mutual interference while enabling simultaneous operation. The first ground and second ground establish independent equipotential environments that eliminate voltage conflicts between the two driving modes.
4Productivity
If two types of grounds are used, then simultaneous display and touch driving is enabled, but signal delivery between differently-grounded components becomes challenging
Solution Approach 1:
The patent introduces ground modulation circuits as intermediary components that facilitate signal delivery between the first ground and second ground systems. These modulation circuits act as mediators that can translate and transfer signals across the ground potential difference, enabling communication between differently-grounded components without direct ground connections.
Data Source
AI summary
Disclosed are a touch display device, a touch display panel, and a driving circuit. More specifically, the present disclosure provides a touch display device, a touch display panel, and a driving circuit which can simultaneously perform display driving and touch driving through a ground modulation technique.